Hot dipped galvanized steel coil
Contents |
[edit] Introduction
One of the most popular forms of galvanized steel bought from coils is hot dipped.
This means that there will likely be a zinc layer on the outside of the sheets that will act as a barrier, separating the galvanized steel from outer elements. It is then far more durable than common steel sheets. Essentially, it is positioned in a molten bath of pure zinc, ultimately causing chemical changes that will make it much more durable.
[edit] How does the hot-dipped galvanizing (HDG) process work?
This technique, also called HDG, is now a lot more common. Galvanizing is basically the process of adding a coating on any base metal for the purpose of increasing corrosion resistance and durability. Hot-dip galvanizing is a form of galvanization. It is the process of coating iron and steel with zinc. That is, the surface of the base metal is coated with a zinc layer by immersing the metal in a bath of molten zinc at a temperature of around 450 °C (842 °F).
Galvanized steel is widely used in applications where corrosion resistance is needed. But its cost is much lower than the cost of stainless steel.
[edit] Difference between hot-dip galvanizing and cold galvanizing
In hot-dip galvanization, the base metal is dipped into a bath of molten zinc at 450 °C. The zinc coating is thicker. Cold galvanizing is where the zinc salt solution is plated to the base metal by the process of electrolysis. This process does not involve any kind of heating. During the process of cold galvanizing, the zinc is deposited on the base metal at the anode which is thin and may not be uniform. As it is conducted in a wet environment, the coating layer of zinc can come off quite easily.
Generally, materials that are simply galvanized may last at least 30 years. The addition of zinc on the outside, as well as the metallurgical process that will occur, will allow it to last many extra decades. It's also possible to get similar results by having a zinc-iron alloy instead.
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
From Chaucer to Fawlty Towers.
Electrotechnical excellence, now open for entries.
Net zero electricity grids BSRIA guide NZG 5/2024
Outlining the changes needed to transition to net zero.
CIOB Global Student Challenge 2024
Universitas Indonesia wins for second year running.
New project and cultural district described in detail.
The nature of EPCs, crticism and inaccuracies.
History, issues and redesign.
From waste recycling to energy performance the hierchy.
An introduction to WERCS and WEEE responsibilities
Dealing with 2 million tonnes of waste equipment a year.
Global BACS Market: analytics and optimisation
A BSRIA glance at building automation and control systems.
What it is and how to use it.
Types of insulating plaster by binder and insulant.
Investors in People: CIOB achieves gold
Reflecting a commitment to employees and members.
Scratching beneath the surface; a guide to selection.
ECA 2024 Apprentice of the Year Award
Entries open for submission until May 31.
UK gov apprenticeship funding from April 2024
Brief summary the policy paper updated in March.